Observation of crystal nuclei of aluminum refined by Al-Ti-B master alloy

摘要

The crystal heterogeneous nuclei of high purity aluminum refined by Al-Ti-B master alloy were studied by SEM and the mechanism of heterogeneous nucleation was discussed. It was found that the cluster of TiB2 particles was in the center of grains, and a number of small protrusions were found on the surface of the particles. It was also found that the cluster was surrounded with the dendrites or circles enriched in Ti.